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                        自述
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                            <b>1.</b>
                        
                        介绍
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                            <b>1.1.</b>
                        
                        动机
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                            <b>1.2.</b>
                        
                        核心概念
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                            <b>1.3.</b>
                        
                        三大原则
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                            <b>1.4.</b>
                        
                        先前技术
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                            <b>1.5.</b>
                        
                        生态系统
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                            <b>1.6.</b>
                        
                        示例
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                            <b>2.</b>
                        
                        基础
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                            <b>2.1.</b>
                        
                        Action
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                            <b>2.2.</b>
                        
                        Reducer
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                            <b>2.3.</b>
                        
                        Store
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                            <b>2.4.</b>
                        
                        数据流
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                            <b>2.5.</b>
                        
                        搭配 React
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                            <b>2.6.</b>
                        
                        示例：Todo List
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                            <b>3.</b>
                        
                        高级
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                            <b>3.1.</b>
                        
                        异步 Action
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                            <b>3.2.</b>
                        
                        异步数据流
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                            <b>3.3.</b>
                        
                        Middleware
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                            <b>3.4.</b>
                        
                        搭配 React Router
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                            <b>3.5.</b>
                        
                        示例：Reddit API
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                            <b>3.6.</b>
                        
                        下一步
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                            <b>4.</b>
                        
                        技巧
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                            <b>4.1.</b>
                        
                        迁移到 Redux
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                            <b>4.2.</b>
                        
                        使用对象展开运算符
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                            <b>4.3.</b>
                        
                        减少样板代码
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                            <b>4.4.</b>
                        
                        服务端渲染
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                            <b>4.5.</b>
                        
                        编写测试
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                            <b>4.6.</b>
                        
                        计算衍生数据
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                            <b>4.7.</b>
                        
                        实现撤销重做
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                            <b>4.8.</b>
                        
                        子应用隔离
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                            <b>4.9.</b>
                        
                        组织 Reducer
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                            <b>4.9.1.</b>
                        
                        Reducer 基础概念
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                            <b>4.9.2.</b>
                        
                        Reducer 基础结构
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        <li class="chapter " data-level="4.9.3" data-path="docs/recipes/reducers/SplittingReducerLogic.html">
            
                
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                            <b>4.9.3.</b>
                        
                        Reducer 逻辑拆分
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        <li class="chapter " data-level="4.9.4" data-path="docs/recipes/reducers/RefactoringReducersExample.html">
            
                
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                            <b>4.9.4.</b>
                        
                        Reducer 重构示例
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                            <b>4.9.5.</b>
                        
                        `combineReducers` 用法
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        <li class="chapter " data-level="4.9.6" data-path="docs/recipes/reducers/BeyondCombineReducers.html">
            
                
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                            <b>4.9.6.</b>
                        
                        `combineReducers` 进阶
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        <li class="chapter " data-level="4.9.7" data-path="docs/recipes/reducers/NormalizingStateShape.html">
            
                
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                            <b>4.9.7.</b>
                        
                        State 范式化
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        <li class="chapter " data-level="4.9.8" data-path="docs/recipes/reducers/UpdatingNormalizedData.html">
            
                
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                            <b>4.9.8.</b>
                        
                        管理范式化数据
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        <li class="chapter " data-level="4.9.9" data-path="docs/recipes/reducers/ReusingReducerLogic.html">
            
                
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                            <b>4.9.9.</b>
                        
                        Reducer 逻辑复用
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        <li class="chapter " data-level="4.9.10" data-path="docs/recipes/reducers/ImmutableUpdatePatterns.html">
            
                
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                            <b>4.9.10.</b>
                        
                        不可变更新模式
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        <li class="chapter " data-level="4.9.11" data-path="docs/recipes/reducers/InitializingState.html">
            
                
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                            <b>4.9.11.</b>
                        
                        初始化 State
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        <li class="chapter " data-level="5" data-path="docs/FAQ.html">
            
                
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                            <b>5.</b>
                        
                        常见问题
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        <li class="chapter " data-level="5.1" data-path="docs/faq/General.html">
            
                
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                            <b>5.1.</b>
                        
                        综合
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        <li class="chapter " data-level="5.2" data-path="docs/faq/Reducers.html">
            
                
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                            <b>5.2.</b>
                        
                        Reducer
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        <li class="chapter " data-level="5.3" data-path="docs/faq/OrganizingState.html">
            
                
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                            <b>5.3.</b>
                        
                        组织 State
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        <li class="chapter " data-level="5.4" data-path="docs/faq/StoreSetup.html">
            
                
                    <a href="../../docs/faq/StoreSetup.html">
                
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                            <b>5.4.</b>
                        
                        创建 Store
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        <li class="chapter " data-level="5.5" data-path="docs/faq/Actions.html">
            
                
                    <a href="../../docs/faq/Actions.html">
                
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                            <b>5.5.</b>
                        
                        Action
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        <li class="chapter " data-level="5.6" data-path="docs/faq/CodeStructure.html">
            
                
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                            <b>5.6.</b>
                        
                        代码结构
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        <li class="chapter " data-level="5.7" data-path="docs/faq/Performance.html">
            
                
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                            <b>5.7.</b>
                        
                        性能
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        <li class="chapter " data-level="5.8" data-path="docs/faq/ReactRedux.html">
            
                
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                            <b>5.8.</b>
                        
                        React Redux
                    </a>
            
            
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        <li class="chapter " data-level="5.9" data-path="docs/faq/Miscellaneous.html">
            
                
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                            <b>5.9.</b>
                        
                        其它
                    </a>
            
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="6" data-path="docs/Troubleshooting.html">
            
                
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                            <b>6.</b>
                        
                        排错
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        <li class="chapter " data-level="7" data-path="docs/Glossary.html">
            
                
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                            <b>7.</b>
                        
                        词汇表
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        <li class="chapter " data-level="8" data-path="docs/api/index.html">
            
                
                    <a href="../../docs/api/index.html">
                
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                            <b>8.</b>
                        
                        API 文档
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="8.1" data-path="docs/api/createStore.html">
            
                
                    <a href="../../docs/api/createStore.html">
                
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                            <b>8.1.</b>
                        
                        createStore
                    </a>
            
            
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        <li class="chapter " data-level="8.2" data-path="docs/api/Store.html">
            
                
                    <a href="../../docs/api/Store.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.2.</b>
                        
                        Store
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        </li>
    
        <li class="chapter " data-level="8.3" data-path="docs/api/combineReducers.html">
            
                
                    <a href="../../docs/api/combineReducers.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.3.</b>
                        
                        combineReducers
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.4" data-path="docs/api/applyMiddleware.html">
            
                
                    <a href="../../docs/api/applyMiddleware.html">
                
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                            <b>8.4.</b>
                        
                        applyMiddleware
                    </a>
            
            
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        <li class="chapter " data-level="8.5" data-path="docs/api/bindActionCreators.html">
            
                
                    <a href="../../docs/api/bindActionCreators.html">
                
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                            <b>8.5.</b>
                        
                        bindActionCreators
                    </a>
            
            
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        <li class="chapter " data-level="8.6" data-path="docs/api/compose.html">
            
                
                    <a href="../../docs/api/compose.html">
                
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                            <b>8.6.</b>
                        
                        compose
                    </a>
            
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="9" data-path="docs/react-redux/index.html">
            
                
                    <a href="../../docs/react-redux/index.html">
                
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                            <b>9.</b>
                        
                        react-redux 文档
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="docs/react-redux/api.html">
            
                
                    <a href="../../docs/react-redux/api.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.1.</b>
                        
                        API
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="9.2" data-path="docs/react-redux/troubleshooting.html">
            
                
                    <a href="../../docs/react-redux/troubleshooting.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.2.</b>
                        
                        排错
                    </a>
            
            
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                        <a id="edit-link" href="https://github.com/camsong/redux-in-chinese/tree/master/docs/recipes/ComputingDerivedData.md" class="btn fa fa-edit pull-left">&#xA0;&#xA0;&#x5F00;&#x59CB;&#x7EA0;&#x9519;</a><h1 id="%E8%AE%A1%E7%AE%97%E8%A1%8D%E7%94%9F%E6%95%B0%E6%8D%AE">&#x8BA1;&#x7B97;&#x884D;&#x751F;&#x6570;&#x636E;</h1>
<p><a href="https://github.com/faassen/reselect.git" target="_blank">Reselect</a> &#x5E93;&#x53EF;&#x4EE5;&#x521B;&#x5EFA;&#x53EF;&#x8BB0;&#x5FC6;&#x7684;(Memoized)&#x3001;&#x53EF;&#x7EC4;&#x5408;&#x7684; <strong>selector</strong> &#x51FD;&#x6570;&#x3002;Reselect selectors &#x53EF;&#x4EE5;&#x7528;&#x6765;&#x9AD8;&#x6548;&#x5730;&#x8BA1;&#x7B97; Redux store &#x91CC;&#x7684;&#x884D;&#x751F;&#x6570;&#x636E;&#x3002;</p>
<h3 id="%E5%8F%AF%E8%AE%B0%E5%BF%86%E7%9A%84-selectors-%E5%88%9D%E8%A1%B7">&#x53EF;&#x8BB0;&#x5FC6;&#x7684; Selectors &#x521D;&#x8877;</h3>
<p>&#x9996;&#x5148;&#x8BBF;&#x95EE; <a href="../basics/UsageWithReact.html">Todos &#x5217;&#x8868;&#x793A;&#x4F8B;</a>:</p>
<h4 id="-containers-visibletodolist-js"><code>containers<span class="token operator">/</span>VisibleTodoList<span class="token punctuation">.</span>js</code></h4>
<pre><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> connect <span class="token punctuation">}</span> from <span class="token string">&apos;react-redux&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> toggleTodo <span class="token punctuation">}</span> from <span class="token string">&apos;../actions&apos;</span>
<span class="token keyword">import</span> TodoList from <span class="token string">&apos;../components/TodoList&apos;</span>

<span class="token keyword">const</span> getVisibleTodos <span class="token operator">=</span> <span class="token punctuation">(</span>todos<span class="token punctuation">,</span> filter<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">switch</span> <span class="token punctuation">(</span>filter<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">case</span> <span class="token string">&apos;SHOW_ALL&apos;</span><span class="token punctuation">:</span>
      <span class="token keyword">return</span> todos
    <span class="token keyword">case</span> <span class="token string">&apos;SHOW_COMPLETED&apos;</span><span class="token punctuation">:</span>
      <span class="token keyword">return</span> todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>t <span class="token operator">=</span><span class="token operator">&gt;</span> t<span class="token punctuation">.</span>completed<span class="token punctuation">)</span>
    <span class="token keyword">case</span> <span class="token string">&apos;SHOW_ACTIVE&apos;</span><span class="token punctuation">:</span>
      <span class="token keyword">return</span> todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>t <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token operator">!</span>t<span class="token punctuation">.</span>completed<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> mapStateToProps <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">{</span>
    todos<span class="token punctuation">:</span> <span class="token function">getVisibleTodos</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>todos<span class="token punctuation">,</span> state<span class="token punctuation">.</span>visibilityFilter<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> mapDispatchToProps <span class="token operator">=</span> <span class="token punctuation">(</span>dispatch<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">{</span>
    onTodoClick<span class="token punctuation">:</span> <span class="token punctuation">(</span>id<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token function">toggleTodo</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> VisibleTodoList <span class="token operator">=</span> <span class="token function">connect</span><span class="token punctuation">(</span>
  mapStateToProps<span class="token punctuation">,</span>
  mapDispatchToProps
<span class="token punctuation">)</span><span class="token punctuation">(</span>TodoList<span class="token punctuation">)</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> VisibleTodoList
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;&#x793A;&#x4F8B;&#x4E2D;&#xFF0C;<code>mapStateToProps</code> &#x8C03;&#x7528;&#x4E86; <code>getVisibleTodos</code> &#x6765;&#x8BA1;&#x7B97; <code>todos</code>&#x3002;&#x8FD0;&#x884C;&#x6CA1;&#x95EE;&#x9898;&#xFF0C;&#x4F46;&#x6709;&#x4E00;&#x4E2A;&#x7F3A;&#x70B9;&#xFF1A;&#x6BCF;&#x5F53;&#x7EC4;&#x4EF6;&#x66F4;&#x65B0;&#x65F6;&#x90FD;&#x4F1A;&#x91CD;&#x65B0;&#x8BA1;&#x7B97; <code>todos</code>&#x3002;&#x5982;&#x679C; state tree &#x975E;&#x5E38;&#x5927;&#xFF0C;&#x6216;&#x8005;&#x8BA1;&#x7B97;&#x91CF;&#x975E;&#x5E38;&#x5927;&#xFF0C;&#x6BCF;&#x6B21;&#x66F4;&#x65B0;&#x90FD;&#x91CD;&#x65B0;&#x8BA1;&#x7B97;&#x53EF;&#x80FD;&#x4F1A;&#x5E26;&#x6765;&#x6027;&#x80FD;&#x95EE;&#x9898;&#x3002;Reselect &#x80FD;&#x5E2E;&#x4F60;&#x7701;&#x53BB;&#x8FD9;&#x4E9B;&#x6CA1;&#x5FC5;&#x8981;&#x7684;&#x91CD;&#x65B0;&#x8BA1;&#x7B97;&#x3002;</p>
<h3 id="%E5%88%9B%E5%BB%BA%E5%8F%AF%E8%AE%B0%E5%BF%86%E7%9A%84-selector">&#x521B;&#x5EFA;&#x53EF;&#x8BB0;&#x5FC6;&#x7684; Selector</h3>
<p>&#x6211;&#x4EEC;&#x9700;&#x8981;&#x4E00;&#x4E2A;&#x53EF;&#x8BB0;&#x5FC6;&#x7684; selector &#x6765;&#x66FF;&#x4EE3;&#x8FD9;&#x4E2A; <code>getVisibleTodos</code>&#xFF0C;&#x53EA;&#x5728; <code>state<span class="token punctuation">.</span>todos</code> or <code>state<span class="token punctuation">.</span>visibilityFilter</code> &#x53D8;&#x5316;&#x65F6;&#x91CD;&#x65B0;&#x8BA1;&#x7B97; <code>todos</code>&#xFF0C;&#x800C;&#x5728;&#x5176;&#x5B83;&#x90E8;&#x5206;&#xFF08;&#x975E;&#x76F8;&#x5173;&#xFF09;&#x53D8;&#x5316;&#x65F6;&#x4E0D;&#x505A;&#x8BA1;&#x7B97;&#x3002;</p>
<p>Reselect &#x63D0;&#x4F9B; <code>createSelector</code> &#x51FD;&#x6570;&#x6765;&#x521B;&#x5EFA;&#x53EF;&#x8BB0;&#x5FC6;&#x7684; selector&#x3002;<code>createSelector</code> &#x63A5;&#x6536;&#x4E00;&#x4E2A; input-selectors &#x6570;&#x7EC4;&#x548C;&#x4E00;&#x4E2A;&#x8F6C;&#x6362;&#x51FD;&#x6570;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#x3002;&#x5982;&#x679C; state tree &#x7684;&#x6539;&#x53D8;&#x4F1A;&#x5F15;&#x8D77; input-selector &#x503C;&#x53D8;&#x5316;&#xFF0C;&#x90A3;&#x4E48; selector &#x4F1A;&#x8C03;&#x7528;&#x8F6C;&#x6362;&#x51FD;&#x6570;&#xFF0C;&#x4F20;&#x5165; input-selectors &#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x5E76;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x3002;&#x5982;&#x679C; input-selectors &#x7684;&#x503C;&#x548C;&#x524D;&#x4E00;&#x6B21;&#x7684;&#x4E00;&#x6837;&#xFF0C;&#x5B83;&#x5C06;&#x4F1A;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#x524D;&#x4E00;&#x6B21;&#x8BA1;&#x7B97;&#x7684;&#x6570;&#x636E;&#xFF0C;&#x800C;&#x4E0D;&#x4F1A;&#x518D;&#x8C03;&#x7528;&#x4E00;&#x6B21;&#x8F6C;&#x6362;&#x51FD;&#x6570;&#x3002;</p>
<p>&#x5B9A;&#x4E49;&#x4E00;&#x4E2A;&#x53EF;&#x8BB0;&#x5FC6;&#x7684; selector <code>getVisibleTodos</code> &#x6765;&#x66FF;&#x4EE3;&#x4E0A;&#x9762;&#x7684;&#x65E0;&#x8BB0;&#x5FC6;&#x7248;&#x672C;&#xFF1A;</p>
<h4 id="-selectors-index-js"><code>selectors<span class="token operator">/</span>index<span class="token punctuation">.</span>js</code></h4>
<pre><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> createSelector <span class="token punctuation">}</span> from <span class="token string">&apos;reselect&apos;</span>

<span class="token keyword">const</span> getVisibilityFilter <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> state<span class="token punctuation">.</span>visibilityFilter
<span class="token keyword">const</span> getTodos <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> state<span class="token punctuation">.</span>todos

<span class="token keyword">export</span> <span class="token keyword">const</span> getVisibleTodos <span class="token operator">=</span> <span class="token function">createSelector</span><span class="token punctuation">(</span>
  <span class="token punctuation">[</span> getVisibilityFilter<span class="token punctuation">,</span> getTodos <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span>visibilityFilter<span class="token punctuation">,</span> todos<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span> <span class="token punctuation">(</span>visibilityFilter<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">case</span> <span class="token string">&apos;SHOW_ALL&apos;</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> todos
      <span class="token keyword">case</span> <span class="token string">&apos;SHOW_COMPLETED&apos;</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>t <span class="token operator">=</span><span class="token operator">&gt;</span> t<span class="token punctuation">.</span>completed<span class="token punctuation">)</span>
      <span class="token keyword">case</span> <span class="token string">&apos;SHOW_ACTIVE&apos;</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>t <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token operator">!</span>t<span class="token punctuation">.</span>completed<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">)</span>
</code></pre>
<p>&#x5728;&#x4E0A;&#x4F8B;&#x4E2D;&#xFF0C;<code>getVisibilityFilter</code> &#x548C; <code>getTodos</code> &#x662F; input-selector&#x3002;&#x56E0;&#x4E3A;&#x4ED6;&#x4EEC;&#x5E76;&#x4E0D;&#x8F6C;&#x6362;&#x6570;&#x636E;&#xFF0C;&#x6240;&#x4EE5;&#x88AB;&#x521B;&#x5EFA;&#x6210;&#x666E;&#x901A;&#x7684;&#x975E;&#x8BB0;&#x5FC6;&#x7684; selector &#x51FD;&#x6570;&#x3002;&#x4F46;&#x662F;&#xFF0C;<code>getVisibleTodos</code> &#x662F;&#x4E00;&#x4E2A;&#x53EF;&#x8BB0;&#x5FC6;&#x7684; selector&#x3002;&#x4ED6;&#x63A5;&#x6536; <code>getVisibilityFilter</code> &#x548C; <code>getTodos</code> &#x4E3A; input-selector&#xFF0C;&#x8FD8;&#x6709;&#x4E00;&#x4E2A;&#x8F6C;&#x6362;&#x51FD;&#x6570;&#x6765;&#x8BA1;&#x7B97;&#x8FC7;&#x6EE4;&#x7684; todos &#x5217;&#x8868;&#x3002;</p>
<h3 id="%E7%BB%84%E5%90%88-selector">&#x7EC4;&#x5408; Selector</h3>
<p>&#x53EF;&#x8BB0;&#x5FC6;&#x7684; selector &#x81EA;&#x8EAB;&#x53EF;&#x4EE5;&#x4F5C;&#x4E3A;&#x5176;&#x5B83;&#x53EF;&#x8BB0;&#x5FC6;&#x7684; selector &#x7684; input-selector&#x3002;&#x4E0B;&#x9762;&#x7684; <code>getVisibleTodos</code> &#x88AB;&#x5F53;&#x4F5C;&#x53E6;&#x4E00;&#x4E2A; selector &#x7684; input-selector&#xFF0C;&#x6765;&#x8FDB;&#x4E00;&#x6B65;&#x901A;&#x8FC7;&#x5173;&#x952E;&#x5B57;&#xFF08;keyword&#xFF09;&#x8FC7;&#x6EE4; todos&#x3002;</p>
<pre><code class="lang-js"><span class="token keyword">const</span> getKeyword <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> state<span class="token punctuation">.</span>keyword

<span class="token keyword">const</span> getVisibleTodosFilteredByKeyword <span class="token operator">=</span> <span class="token function">createSelector</span><span class="token punctuation">(</span>
  <span class="token punctuation">[</span> getVisibleTodos<span class="token punctuation">,</span> getKeyword <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span>visibleTodos<span class="token punctuation">,</span> keyword<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> visibleTodos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>
    todo <span class="token operator">=</span><span class="token operator">&gt;</span> todo<span class="token punctuation">.</span>text<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span>keyword<span class="token punctuation">)</span> <span class="token operator">&gt;</span> <span class="token operator">-</span><span class="token number">1</span>
  <span class="token punctuation">)</span>
<span class="token punctuation">)</span>
</code></pre>
<h3 id="%E8%BF%9E%E6%8E%A5-selector-%E5%92%8C-redux-store">&#x8FDE;&#x63A5; Selector &#x548C; Redux Store</h3>
<p>&#x5982;&#x679C;&#x4F60;&#x5728;&#x4F7F;&#x7528; React Redux&#xFF0C;&#x4F60;&#x53EF;&#x4EE5;&#x5728; <code><span class="token function">mapStateToProps</span><span class="token punctuation">(</span><span class="token punctuation">)</span></code> &#x4E2D;&#x5F53;&#x6B63;&#x5E38;&#x51FD;&#x6570;&#x6765;&#x8C03;&#x7528; selectors</p>
<h4 id="-containers-visibletodolist-js"><code>containers<span class="token operator">/</span>VisibleTodoList<span class="token punctuation">.</span>js</code></h4>
<pre><code class="lang-js">iimport <span class="token punctuation">{</span> connect <span class="token punctuation">}</span> from <span class="token string">&apos;react-redux&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> toggleTodo <span class="token punctuation">}</span> from <span class="token string">&apos;../actions&apos;</span>
<span class="token keyword">import</span> TodoList from <span class="token string">&apos;../components/TodoList&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> getVisibleTodos <span class="token punctuation">}</span> from <span class="token string">&apos;../selectors&apos;</span>

<span class="token keyword">const</span> mapStateToProps <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">{</span>
    todos<span class="token punctuation">:</span> <span class="token function">getVisibleTodos</span><span class="token punctuation">(</span>state<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> mapDispatchToProps <span class="token operator">=</span> <span class="token punctuation">(</span>dispatch<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">{</span>
    onTodoClick<span class="token punctuation">:</span> <span class="token punctuation">(</span>id<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token function">toggleTodo</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> VisibleTodoList <span class="token operator">=</span> <span class="token function">connect</span><span class="token punctuation">(</span>
  mapStateToProps<span class="token punctuation">,</span>
  mapDispatchToProps
<span class="token punctuation">)</span><span class="token punctuation">(</span>TodoList<span class="token punctuation">)</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> VisibleTodoList
</code></pre>
<h3 id="%E5%9C%A8-selectors-%E4%B8%AD%E8%AE%BF%E9%97%AE-react-props">&#x5728; selectors &#x4E2D;&#x8BBF;&#x95EE; React Props</h3>
<blockquote>
<p>&#x73B0;&#x5728;&#x5047;&#x4F7F;&#x6211;&#x4EEC;&#x8981;&#x652F;&#x6301;&#x4E00;&#x4E2A;&#x65B0;&#x529F;&#x80FD;&#xFF1A;&#x652F;&#x6301;&#x591A;&#x4E2A; Todo &#x5217;&#x8868;&#x65B0;&#x529F;&#x80FD;&#x3002;&#x4E3A;&#x4E86;&#x7B80;&#x6D01;&#x8D77;&#x89C1;&#xFF0C;&#x7701;&#x7565;&#x4E86;&#x5B9E;&#x73B0;&#x8FD9;&#x4E2A;&#x5DE5;&#x7A0B;&#x4F1A;&#x9047;&#x5230;&#x7684;&#x4E0E;&#x672C;&#x8282;&#x4E0D;&#x76F8;&#x5173;&#x7684;&#x5185;&#x5BB9;&#xFF08;reducers &#x7684;&#x53D8;&#x5316;&#x3001;&#x7EC4;&#x4EF6;&#x3001;Actions &#x7B49;&#xFF09;</p>
</blockquote>
<p>&#x5230;&#x76EE;&#x524D;&#x4E3A;&#x6B62;&#xFF0C;&#x6211;&#x4EEC;&#x53EA;&#x770B;&#x5230; selector &#x63A5;&#x6536; Redux store state &#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x7136;&#x800C;&#xFF0C;selector &#x4E5F;&#x53EF;&#x4EE5;&#x63A5;&#x6536; props&#x3002;</p>
<p>&#x8FD9;&#x513F;&#x6709;&#x4E00;&#x4E2A; <code>App</code> &#x7684;&#x7EC4;&#x4EF6;&#xFF0C;&#x5B83;&#x6E32;&#x67D3;&#x4E86;&#x4E09;&#x4E2A;&#x53EB;&#x505A; <code>VisibleTodoList</code> &#x7684;&#x5B50;&#x7EC4;&#x4EF6;&#xFF0C;&#x6BCF;&#x4E2A;&#x7EC4;&#x4EF6;&#x90FD;&#x5E26;&#x4E00;&#x4E2A; <code>listId</code> &#x7684; prop;</p>
<h4 id="components-app-js">components/App.js</h4>
<pre><code class="lang-js"><span class="token keyword">import</span> React from <span class="token string">&apos;react&apos;</span>
<span class="token keyword">import</span> Footer from <span class="token string">&apos;./Footer&apos;</span>
<span class="token keyword">import</span> AddTodo from <span class="token string">&apos;../containers/AddTodo&apos;</span>
<span class="token keyword">import</span> VisibleTodoList from <span class="token string">&apos;../containers/VisibleTodoList&apos;</span>

<span class="token keyword">const</span> App <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">(</span>
  <span class="token operator">&lt;</span>div<span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>VisibleTodoList listId<span class="token operator">=</span><span class="token string">&quot;1&quot;</span> <span class="token operator">/</span><span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>VisibleTodoList listId<span class="token operator">=</span><span class="token string">&quot;2&quot;</span> <span class="token operator">/</span><span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>VisibleTodoList listId<span class="token operator">=</span><span class="token string">&quot;3&quot;</span> <span class="token operator">/</span><span class="token operator">&gt;</span>
  <span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">&gt;</span>
<span class="token punctuation">)</span>
</code></pre>
<p>&#x6BCF;&#x4E2A; <code>VisibleTodoList</code> &#x5BB9;&#x5668;&#x6839;&#x636E; <code>listId</code> props &#x7684;&#x503C;&#x9009;&#x62E9;&#x4E0D;&#x540C;&#x7684; state &#x5207;&#x7247;&#xFF0C;&#x8BA9;&#x6211;&#x4EEC;&#x4FEE;&#x6539; <code>getVisibilityFilter</code> &#x548C; <code>getTodos</code> &#x6765;&#x63A5;&#x6536; props&#x3002;</p>
<h4 id="selectors-todoselectors-js">selectors/todoSelectors.js</h4>
<pre><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> createSelector <span class="token punctuation">}</span> from <span class="token string">&apos;reselect&apos;</span>

<span class="token keyword">const</span> getVisibilityFilter <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span>
  state<span class="token punctuation">.</span>todoLists<span class="token punctuation">[</span>props<span class="token punctuation">.</span>listId<span class="token punctuation">]</span><span class="token punctuation">.</span>visibilityFilter

<span class="token keyword">const</span> getTodos <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span>
  state<span class="token punctuation">.</span>todoLists<span class="token punctuation">[</span>props<span class="token punctuation">.</span>listId<span class="token punctuation">]</span><span class="token punctuation">.</span>todos

<span class="token keyword">const</span> getVisibleTodos <span class="token operator">=</span> <span class="token function">createSelector</span><span class="token punctuation">(</span>
  <span class="token punctuation">[</span> getVisibilityFilter<span class="token punctuation">,</span> getTodos <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span>visibilityFilter<span class="token punctuation">,</span> todos<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">switch</span> <span class="token punctuation">(</span>visibilityFilter<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">case</span> <span class="token string">&apos;SHOW_COMPLETED&apos;</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">&gt;</span> todo<span class="token punctuation">.</span>completed<span class="token punctuation">)</span>
      <span class="token keyword">case</span> <span class="token string">&apos;SHOW_ACTIVE&apos;</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token operator">!</span>todo<span class="token punctuation">.</span>completed<span class="token punctuation">)</span>
      <span class="token keyword">default</span><span class="token punctuation">:</span>
        <span class="token keyword">return</span> todos
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">)</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> getVisibleTodos
</code></pre>
<p><code>props</code> &#x53EF;&#x4EE5;&#x901A;&#x8FC7; <code>mapStateToProps</code> &#x4F20;&#x9012;&#x7ED9; <code>getVisibleTodos</code>:</p>
<pre><code class="lang-js"><span class="token keyword">const</span> mapStateToProps <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">{</span>
    todos<span class="token punctuation">:</span> <span class="token function">getVisibleTodos</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x73B0;&#x5728;&#xFF0C;<code>getVisibleTodos</code> &#x53EF;&#x4EE5;&#x8BBF;&#x95EE; <code>props</code>&#xFF0C;&#x4E00;&#x5207;&#x770B;&#x4E0A;&#x53BB;&#x90FD;&#x662F;&#x5982;&#x6B64;&#x7684;&#x7F8E;&#x597D;&#x3002;</p>
<p><strong>&#x4F46;&#x662F;&#x8FD9;&#x513F;&#x6709;&#x4E00;&#x4E2A;&#x95EE;&#x9898;&#xFF01;</strong></p>
<p>&#x4F7F;&#x7528;&#x5E26;&#x6709;&#x591A;&#x4E2A; <code>visibleTodoList</code> &#x5BB9;&#x5668;&#x5B9E;&#x4F8B;&#x7684; <code>getVisibleTodos</code> selector &#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x51FD;&#x6570;&#x8BB0;&#x5FC6;&#x529F;&#x80FD;&#x3002;</p>
<h4 id="containers-visibletodolist-js">containers/VisibleTodoList.js</h4>
<pre><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> connect <span class="token punctuation">}</span> from <span class="token string">&apos;react-redux&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> toggleTodo <span class="token punctuation">}</span> from <span class="token string">&apos;../actions&apos;</span>
<span class="token keyword">import</span> TodoList from <span class="token string">&apos;../components/TodoList&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> getVisibleTodos <span class="token punctuation">}</span> from <span class="token string">&apos;../selectors&apos;</span>

<span class="token keyword">const</span> mapStateToProps <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// &#x8B66;&#x544A;&#xFF1A;&#x4E0B;&#x9762;&#x7684; selector &#x4E0D;&#x4F1A;&#x6B63;&#x786E;&#x8BB0;&#x5FC6;</span>
    todos<span class="token punctuation">:</span> <span class="token function">getVisibleTodos</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> mapDispatchToProps <span class="token operator">=</span> <span class="token punctuation">(</span>dispatch<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">{</span>
    onTodoClick<span class="token punctuation">:</span> <span class="token punctuation">(</span>id<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token function">toggleTodo</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> VisibleTodoList <span class="token operator">=</span> <span class="token function">connect</span><span class="token punctuation">(</span>
  mapStateToProps<span class="token punctuation">,</span>
  mapDispatchToProps
<span class="token punctuation">)</span><span class="token punctuation">(</span>TodoList<span class="token punctuation">)</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> VisibleTodoList
</code></pre>
<p>&#x7528; <code>createSelector</code> &#x521B;&#x5EFA;&#x7684; selector &#x53EA;&#x6709;&#x5728;&#x53C2;&#x6570;&#x96C6;&#x4E0E;&#x4E4B;&#x524D;&#x7684;&#x53C2;&#x6570;&#x96C6;&#x76F8;&#x540C;&#x65F6;&#x624D;&#x4F1A;&#x8FD4;&#x56DE;&#x7F13;&#x5B58;&#x7684;&#x503C;&#x3002;&#x5982;&#x679C;&#x6211;&#x4EEC;&#x4EA4;&#x66FF;&#x7684;&#x6E32;&#x67D3; <code>VisibleTodoList listId<span class="token operator">=</span><span class="token string">&quot;1&quot;</span> <span class="token operator">/</span><span class="token operator">&gt;</span></code> &#x548C; <code>VisibleTodoList listId<span class="token operator">=</span><span class="token string">&quot;2&quot;</span> <span class="token operator">/</span><span class="token operator">&gt;</span></code>&#xFF0C;&#x5171;&#x4EAB;&#x7684; selector &#x5C06;&#x4EA4;&#x66FF;&#x7684;&#x63A5;&#x6536; <code>listId<span class="token punctuation">:</span> <span class="token number">1</span></code> &#x548C; <code>listId<span class="token punctuation">:</span> <span class="token number">2</span></code>&#x3002;&#x8FD9;&#x4F1A;&#x5BFC;&#x81F4;&#x6BCF;&#x6B21;&#x8C03;&#x7528;&#x65F6;&#x4F20;&#x5165;&#x7684;&#x53C2;&#x6570;&#x4E0D;&#x540C;&#xFF0C;&#x56E0;&#x6B64; selector &#x5C06;&#x59CB;&#x7EC8;&#x91CD;&#x65B0;&#x8BA1;&#x7B97;&#x800C;&#x4E0D;&#x662F;&#x8FD4;&#x56DE;&#x7F13;&#x5B58;&#x7684;&#x503C;&#x3002;&#x6211;&#x4EEC;&#x5C06;&#x5728;&#x4E0B;&#x4E00;&#x8282;&#x4E86;&#x89E3;&#x5982;&#x4F55;&#x89E3;&#x51B3;&#x8FD9;&#x4E2A;&#x9650;&#x5236;&#x3002;</p>
<h3 id="%E8%B7%A8%E5%A4%9A%E7%BB%84%E4%BB%B6%E7%9A%84%E5%85%B1%E4%BA%AB-selector">&#x8DE8;&#x591A;&#x7EC4;&#x4EF6;&#x7684;&#x5171;&#x4EAB; Selector</h3>
<blockquote>
<p>&#x8FD9;&#x8282;&#x4E2D;&#x7684;&#x4F8B;&#x5B50;&#x9700;&#x8981; React Redux v4.3.0 &#x6216;&#x8005;&#x66F4;&#x9AD8;&#x7684;&#x7248;&#x672C;</p>
</blockquote>
<p>&#x4E3A;&#x4E86;&#x8DE8;&#x8D8A;&#x591A;&#x4E2A; <code>VisibleTodoList</code> &#x7EC4;&#x4EF6;&#x5171;&#x4EAB; selector&#xFF0C;<strong>&#x4E8E;&#x6B64;&#x540C;&#x65F6;</strong>&#x6B63;&#x786E;&#x8BB0;&#x5FC6;&#x3002;&#x6BCF;&#x4E2A;&#x7EC4;&#x4EF6;&#x7684;&#x5B9E;&#x4F8B;&#x9700;&#x8981;&#x6709;&#x62F7;&#x8D1D; selector &#x7684;&#x79C1;&#x6709;&#x7248;&#x672C;&#x3002;</p>
<p>&#x6211;&#x4EEC;&#x521B;&#x5EFA;&#x4E00;&#x4E2A; <code>makeGetVisibleTodos</code> &#x7684;&#x51FD;&#x6570;&#xFF0C;&#x5728;&#x6BCF;&#x4E2A;&#x8C03;&#x7528;&#x7684;&#x65F6;&#x5019;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A; <code>getVisibleTodos</code> selector &#x7684;&#x65B0;&#x62F7;&#x8D1D;&#x3002;</p>
<h4 id="selectors-todoselectors-js">selectors/todoSelectors.js</h4>
<pre><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> createSelector <span class="token punctuation">}</span> from <span class="token string">&apos;reselect&apos;</span>

<span class="token keyword">const</span> getVisibilityFilter <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span>
  state<span class="token punctuation">.</span>todoLists<span class="token punctuation">[</span>props<span class="token punctuation">.</span>listId<span class="token punctuation">]</span><span class="token punctuation">.</span>visibilityFilter

<span class="token keyword">const</span> getTodos <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span>
  state<span class="token punctuation">.</span>todoLists<span class="token punctuation">[</span>props<span class="token punctuation">.</span>listId<span class="token punctuation">]</span><span class="token punctuation">.</span>todos

<span class="token keyword">const</span> makeGetVisibleTodos <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token function">createSelector</span><span class="token punctuation">(</span>
    <span class="token punctuation">[</span> getVisibilityFilter<span class="token punctuation">,</span> getTodos <span class="token punctuation">]</span><span class="token punctuation">,</span>
    <span class="token punctuation">(</span>visibilityFilter<span class="token punctuation">,</span> todos<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">switch</span> <span class="token punctuation">(</span>visibilityFilter<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">case</span> <span class="token string">&apos;SHOW_COMPLETED&apos;</span><span class="token punctuation">:</span>
          <span class="token keyword">return</span> todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">&gt;</span> todo<span class="token punctuation">.</span>completed<span class="token punctuation">)</span>
        <span class="token keyword">case</span> <span class="token string">&apos;SHOW_ACTIVE&apos;</span><span class="token punctuation">:</span>
          <span class="token keyword">return</span> todos<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>todo <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token operator">!</span>todo<span class="token punctuation">.</span>completed<span class="token punctuation">)</span>
        <span class="token keyword">default</span><span class="token punctuation">:</span>
          <span class="token keyword">return</span> todos
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x6211;&#x4EEC;&#x8FD8;&#x9700;&#x8981;&#x4E00;&#x79CD;&#x6BCF;&#x4E2A;&#x5BB9;&#x5668;&#x8BBF;&#x95EE;&#x81EA;&#x5DF1;&#x79C1;&#x6709; selector &#x7684;&#x65B9;&#x5F0F;&#x3002;<code>connect</code> &#x7684; <code>mapStateToProps</code> &#x51FD;&#x6570;&#x53EF;&#x4EE5;&#x5E2E;&#x52A9;&#x6211;&#x4EEC;&#x3002;</p>
<p><strong>&#x5982;&#x679C; <code>connect</code> &#x7684; <code>mapStateToProps</code> &#x8FD4;&#x56DE;&#x7684;&#x4E0D;&#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x800C;&#x662F;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x4ED6;&#x5C06;&#x88AB;&#x7528;&#x505A;&#x4E3A;&#x6BCF;&#x4E2A;&#x5BB9;&#x5668;&#x7684;&#x5B9E;&#x4F8B;&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x5355;&#x72EC;&#x7684; <code>mapStateToProps</code> &#x51FD;&#x6570;&#x3002;</strong></p>
<p>&#x4E0B;&#x9762;&#x4F8B;&#x5B50;&#x4E2D;&#x7684; <code>makeMapStateToProps</code> &#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x65B0;&#x7684; <code>getVisibleTodos</code> selectors&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x72EC;&#x5360;&#x65B0; selector &#x7684;&#x6743;&#x9650;&#x7684; <code>mapStateToProps</code> &#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-js"><span class="token keyword">const</span> makeMapStateToProps <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> getVisibleTodos <span class="token operator">=</span> <span class="token function">makeGetVisibleTodos</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token keyword">const</span> mapStateToProps <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">{</span>
      todos<span class="token punctuation">:</span> <span class="token function">getVisibleTodos</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">return</span> mapStateToProps
<span class="token punctuation">}</span>
</code></pre>
<p>&#x5982;&#x679C;&#x6211;&#x4EEC;&#x901A;&#x8FC7; <code>makeMapStateToProps</code> &#x6765; <code>connect</code>&#xFF0C;<code>VisibleTodosList</code> &#x5BB9;&#x5668;&#x7684;&#x6BCF;&#x4E2A;&#x7EC4;&#x4EF6;&#x90FD;&#x4F1A;&#x62E5;&#x6709;&#x542B;&#x79C1;&#x6709; <code>getVisibleTodos</code> selector &#x7684; <code>mapStateToProps</code>&#x3002;&#x4E0D;&#x8BBA; <code>VisibleTodosList</code> &#x5BB9;&#x5668;&#x7684;&#x5C55;&#x73B0;&#x987A;&#x5E8F;&#x5982;&#x4F55;&#xFF0C;&#x8BB0;&#x5FC6;&#x529F;&#x80FD;&#x90FD;&#x4F1A;&#x6B63;&#x5E38;&#x5DE5;&#x4F5C;&#x3002;</p>
<h4 id="container-visibletodoslist-js">container/VisibleTodosList.js</h4>
<pre><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> connect <span class="token punctuation">}</span> from <span class="token string">&apos;react-redux&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> toggleTodo <span class="token punctuation">}</span> from <span class="token string">&apos;../actions&apos;</span>
<span class="token keyword">import</span> TodoList from <span class="token string">&apos;../components/TodoList&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> makeGetVisibleTodos <span class="token punctuation">}</span> from <span class="token string">&apos;../selectors&apos;</span>

<span class="token keyword">const</span> makeMapStateToProps <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> getVisibleTodos <span class="token operator">=</span> <span class="token function">makeGetVisibleTodos</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token keyword">const</span> mapStateToProps <span class="token operator">=</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">{</span>
      todos<span class="token punctuation">:</span> <span class="token function">getVisibleTodos</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> props<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">return</span> mapStateToProps
<span class="token punctuation">}</span>

<span class="token keyword">const</span> mapDispatchToProps <span class="token operator">=</span> <span class="token punctuation">(</span>dispatch<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">{</span>
    onTodoClick<span class="token punctuation">:</span> <span class="token punctuation">(</span>id<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">dispatch</span><span class="token punctuation">(</span><span class="token function">toggleTodo</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> VisibleTodoList <span class="token operator">=</span> <span class="token function">connect</span><span class="token punctuation">(</span>
  makeMapStateToProps<span class="token punctuation">,</span>
  mapDispatchToProps
<span class="token punctuation">)</span><span class="token punctuation">(</span>TodoList<span class="token punctuation">)</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> VisibleTodoList
</code></pre>
<h3 id="%E4%B8%8B%E4%B8%80%E6%AD%A5">&#x4E0B;&#x4E00;&#x6B65;</h3>
<p>&#x67E5;&#x770B; <a href="https://github.com/reactjs/reselect" target="_blank">&#x5B98;&#x65B9;&#x6587;&#x6863;</a> &#x548C; <a href="https://github.com/reactjs/reselect#faq" target="_blank">FAQ</a>&#x3002;&#x5F53;&#x56E0;&#x4E3A;&#x592A;&#x591A;&#x7684;&#x884D;&#x751F;&#x8BA1;&#x7B97;&#x548C;&#x91CD;&#x590D;&#x6E32;&#x67D3;&#x5BFC;&#x81F4;&#x51FA;&#x73B0;&#x6027;&#x80FD;&#x95EE;&#x9898;&#x65F6;&#xFF0C;&#x5927;&#x591A;&#x6570;&#x7684; Redux &#x9879;&#x76EE;&#x4F1A;&#x5F00;&#x59CB;&#x4F7F;&#x7528; Reselect&#x3002;&#x6240;&#x4EE5;&#x5728;&#x4F60;&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x5927;&#x578B;&#x9879;&#x76EE;&#x7684;&#x65F6;&#x5019;&#x786E;&#x4FDD;&#x4F60;&#x5BF9; reselect &#x662F;&#x719F;&#x6089;&#x7684;&#x3002;&#x4F60;&#x4E5F;&#x53EF;&#x4EE5;&#x53BB;&#x7814;&#x7A76;&#x4ED6;&#x7684; <a href="https://github.com/reactjs/reselect/blob/master/src/index.js" target="_blank">&#x6E90;&#x7801;</a>&#xFF0C;&#x8FD9;&#x6837;&#x4F60;&#x5C31;&#x4E0D;&#x8BA4;&#x4E3A;&#x4ED6;&#x662F;&#x9ED1;&#x9B54;&#x6CD5;&#x4E86;&#x3002;</p>

                    
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